Mixing valve

ABSTRACT

A mixing valve with a single operating handle enabling independent control of the discharge volume, the mixing ratio and the discharge direction of two miscible liquids. The mixing valve comprises a first valve member mounted in a valve housing for rotary movement relative to an adjacent fixed valve disc provided with two eccentric feeding passages for the miscible liquids, said first valve member having a transverse bore communicating with an internal inlet passage which in turn communicates dependent on the rotary position with one or both of the feed passages, a second valve member movable within said transverse bore between positions connecting said inlet passage to any one or none of two discharge lines, and an operating handle adapted to independently adjust the positions of both valve members.

United States Patent Grosche July 25,1972

[ MIXING VALVE Manfred Grosche, Gneisenaustr. 33, 2000 Hamburg 20,Germany 22 Filed: March 13, 1970 21 Appl.No.: 19,282

[72] Inventor:

[30] Foreign Application Priority Data March 22, 1969 Germany ..P l9 14694.2

[52] US. Cl ..137/636.2 [51] Int. Cl ..Fl6k 11/00 [56] References CltedUNITED STATES PATENTS Fraser ..l37/636.2 X

Primary Examiner-Henry T. Klinksiek Attorney-Michael S. Striker 57ABSTRACT A mixing valve with a single operating handle enablingindependent control of the discharge volume, the mixing ratio and thedischarge direction of two miscible liquids. The mixing valve comprisesa first valve member mounted in a valve housing for rotarymovementrelative to an adjacent fixed valve disc provided with two eccentricfeeding passages for the miscible liquids, said first valve memberhaving a transverse bore communicating with an internal inlet passagewhich in turn communicates dependent on the rotary position with one orboth of the feed passages, a second valve member movablewithin saidtransverse bore between positions connecting said inlet passage to anyone or none of two discharge lines, and an operating handle adapted toindependently adjust the positions of both valve members.

11 Claims, 13 Drawing Figures Patented July 25, 1972 3,678,961

5 Shuts-Sheet 1 Inavron:

murgep 62520:

Patented July 25, 1972 3,678,961

5 Shuts-Shoot 3 Patented July 25, 1972 5 Shoqts-Shoet 4 I wE/u m1BACKGROUND OF THE INVENTION The present invention relates to a mixingvalve, and more particular to a mixing valve enabling independentcontrol of bath rooms which generally comprise a housing with twofeeding lines for hot and cold water, two discharge outlets, usuallyleading to the bath-tub and the shower, respectively, first valve meansfor reciprocally controlling the cross section of the outlets for hotand cold water, second valve means for controlling the discharge volume,third valve means for controlling the discharge direction to either thebath-tub or the shower, and the necessary operating handles foractuating said first, second and thirdvalve means. These known mixingvalves suffer from the disadvantage that several operating handles haveto be actuated in order to have the water flow with the desired rate andtemperature through the chosen outlet.

Besides that there are known mixing valves having only one outlet, inwhich the valve means controlling the discharge rate and the mixingratio are combined in such a way that they can be adjusted by a singleoperating handle. Such mixing valves are disclosed in German Patents 900036, l 021 668, l 128 236, l 144 982 and l 149 21 1. None of these knownmixing valves permits however, to direct the discharged liquid at willeither to the bath-tub or to the shower. To this purpose it would benecessary to install an additional flow reversion cock of the known typeso that again at least two handles have to be operated. Besides that theknown mixing valves usually do not permit to maintain the mixing ratiowhen closing and reopening the valve. With other mixing valves it ispossible to maintain the mixing ratio during closing and reopening, butthe mixing ratio can only be adjusted in the closed position, so that itis not possible to adjust the mixing ratio while feeling the temperatureof the discharged water.

SUMMARY OF THE INVENTION It is, accordingly, an object of the presentinvention to overcome these disadvantages.

More particularly it is an object of the present invention to provide animproved mixing valve enabling independent control of the dischargevolume, the mixing ratio and the discharge direction of two miscibleliquids by a single operating handle.

it is a further object of the invention to provide a mixing valve whichpermits to maintain a certain mixing ratio when changing the dischargerate and/or the discharge direction.

A still further object of the invention is to provide a mixing valvewhich enables to adjust the mixing ratio and/or the discharge rate whenfeeling the temperature of the discharge water.

in accordance with the above objects and others which will becomeapparent hereafter, one feature of my invention results in the provisionof a mixing valve comprising a valve housing having a valve receivingbore, a valve disc nonrotatably mounted in said valve receiving bore, afirst valve member received in said valve receiving bore for movementabout a rotary axis and having a valve face symmetrical to the rotaryaxis and fitted in sliding contact against the internal face of saidvalve disc, first and second disc passages disposed in said valve disceccentrically and at a predetermined angular distance relative to therotary axis of said first valve member, a transverse bore disposed insaid first valve member, an inlet passage extending from the innersurface of said transverse bore to an opening excentrically disposed onsaid valve face, said first valve member being movable relative to saidvalve disc between a first position in which said inlet passagecommunicates with said first disc passage, a second position in whichsaid inlet passage communicates with said second disc passage, and aplurality of intermediate positions, in each of which said inlet passagecommunicates with both disc passages in a certain predetermined ratio ofcross-sections,

first and second discharge passages extending from first and secondpoints, respectively of the inner surface of said transverse bore tofirst and second outward openings, respectively, first and seconddischarge lines communicating with the outward openings of said firstand second discharge passages, respectively, a second valve memberreceived in said transverse bore and having a'valve passagecommunicating with said'inlet passage, said second valve member beingmovable between a first discharge position in which said valve passagecommunicates with said first discharge passage. a second dischargeposition in which said valve passage communicates with said seconddischarge passage, and an intermediate position in which said valvepassage communicates with neither one of the discharge passages, firstand second feed lines for said miscible liquids communicating with saidfirst and second disc passages, respectively, and an operating handlemounted on said second valve member for the independent movement of saidfirst and second valve members between the first, second andintermediate positions thereof.

According to a preferred embodiment there is provided a mixing valvewherein the transverse bore comprises a cylindrical central section,first and second cylindrical outer sections coaxial to said centralsection and having an increased diameter, and first and secondtransition sections disposed between said central section and said firstand second outer sections, respectively, the inlet passage opens intosaid central section, said first and second discharge passages open intosaid first and second transition sections, respectively, said secondvalve member is received within said transverse bore for rotational andaxial movement, said second valve member having mounted thereon firstand second outward sealing rings sealingly engaging the inner surface ofsaid first and second outer sections, respectively, of said transversebore, and first and second inner sealing rings adapted to sealinglyengage in the intermediate position of said second valve member theinner surface of the central section of said transverse bore,said'second valve member further having an annular passage definedbetween said first and second inner sealing rings and communicating withsaid inlet passage, said second valve member being axially movablebetween first and second discharge positions, in which the respectiveone of the first and second inner sealing rings is moved out of contactwith the central section of said transverse bore, thus providing apassage between said inlet passage and the respective one of the firstand second discharge passages.

According to another embodiment there is provided a mixing valve whereinsaid transverse bore has a cylindrical inner surface, said second valvemember is received in said transverse bore for only rotational movement,and is provided with a valve passage which in all rotational positionsof said second valve member communicates'with said inlet passage, and incertain different rotational positions of said second valve membercommunicates with one of said discharge passages.

At least one of said first and second discharge passages may extend to acircumferential annular groove on said first valve member, and therespective one of said first and second discharge lines may extendthrough the wall of said valve housing in a manner communicating withthe respective annular groove. On the other hand one of said first andsecond discharge passages may communicate with a respective dischargeline extending through said valve disc coaxially to the rotary axis ofsaid first valve member. According to a further different embodiment oneof said first and second discharge passages may communicate with arespective discharge line directly connected to said first valve member.

It is preferred to provide guide means mounted on said first valvemember and restricting the movement of the operating handle relativethereto. Said first and second disc passages can be disposed close toeach other in the same radial distance from the rotary axis of the firstvalve member. It is also possible, however, to arrange said first andsecond disc passages in different radial distances from the rotary axis.In both cases it is preferred to adapt the shape and dimension of theopening of the inlet passage in such a manner that in the intermediatepositions of said first valve member relative to said valve disc thereare obtained cross-sections of communication with both disc passageswhich together permit an unreduced discharge rate.

A further embodiment of the mixing valve of the invention specificlyadapted to the case that the hot water is produced in a flow heater, ischaracterized in that said valve disc is provided with a first discpassage disposed at a radial distance from the rotary axis of said firstvalve member and communicating with a first feed line for untreatedliquid, a second disc passage disposed coaxially with said rotary axisand communicating via a connecting line to the outlet of a liquidtreating device, and a third disc passage disposed in the same radialdistance from said rotary axis as the first disc passage, said thirddisc passage communicating via a connecting line to the inlet of saidliquid treating device, and said first valve member is further providedwith a reversing channel separated from the opening of said inletpassage by a dividing edge which in accordance with the relativeposition of said dividing edge to said first disc passage provides for acorresponding partial flow through said reversing channel, said thirddisc passage, said liquid treatingdevice and said second disc passageinto said inlet passage. 7

This type of mixing valve can be used in other cases where it is desiredto mix treated and non-treated portions of the same liquid.

The transverse bore provided in said first valve member can be closedafter insertion of said second valve member by means of suitable coverplates. In this case each of said first and second transition sectionsmay form an annular valve seat and said second valve member may bedivided into a first and a second valve piston biased by first andsecond spring means, respectively, against the respective annular valveseat. In this embodiment the operating handle is pivotally mounted andadapted to remove when pivoted to the one direction the first valvepiston from the first valve seat, and when pivoted to the oppositedirection to remove the second valve piston from the second valve seat.

The novel features which are considered as characteristic connectionwith the accompanied drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a perspective view showingone embodiment of the novel mixing valve,

FIG. 2 is a vertical section through the mixing valve according to FIG.1;

FIG. 3 is a horizontal section through the mixing valve seen in thedirection of arrows from the line AA of FIG. 2;

FIG. 4 is a cross-section through the mixing valve as seen in thedirection of arrows from the line B-B of FIG. 2;

FIG. 5 is a vertical section through a modified mixing valve;

FIG. 6 is a horizontal section as seen in the direction of arrows fromthe line FF ofFIG. 5;

FIG. 7 is a cross-section through the mixing valve as seen in thedirection of arrows from the line D-D of FIG. 5;

FIG. 8 is a cross-section corresponding to FIG. 7 through a furthermodified mixing valve,

FIG. 9 is a schematic section long the line G-G of FIG. 8;

FIG. 10 is a vertical section through a still further modified mixingvalve;

FIG. II is a horizontal section through the mixing valve according toFIG. 10 along the line H--H;

FIG. 12 is a cross-section through the mixing valve of FIG. 10 along theline J-J; and

FIG. 13 is a schematic section through the mixing valve of FIG. 12 alongthe line L-L.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The mixing valve shown in FIGS.1 to 4 comprises a valve housing 1 having a conical valve receiving bore2 which communicates with a first discharge line 3 and a seconddischarge line 4. A first valve member 5 is received in the valvereceiving bore 2 for rotary movement. vThe valve member S has a conicalcircumferential surface fitted into the inner wall of the bore 2, and aplane valve face 7 disposed vertically relative to the rotary axis andfitted in sliding contact against the plane internal face of a valvedisc 15 which is non-rotatably mounted in the valve receiving bore 2 ofthe valve housing I. The'valve disc 15 is pressed against the firstvalve member 5 by means of a spring ring 30 kept in place by a circlip34 snapped into an annular groove in the valve housing I.

The valve disc 15 is provided with a first disc passage l6 connected toa first feed line 20 for cold water, and a second disc passage 17connected to a second feed line 21 for hot water. The disc passages 16and 17 are disposed excentrically and at an angular distance relative tothe rotary axis of the first valve member 5. The inner wall of the valvereceiving bore 2 is provided with two radially inwardly projecting studs33 which engage with corresponding marginal recesses of valve disc 15.

The first valve member 5 is shaped as shown in FIGS. 2 and 3 andprovided with a transverse bore 8 which receives a second valve member12 for rotary and axially sliding movement. The transverse bore 8comprises a cylindrical central section 8a, first and second cylindricalouter sections 8b coaxial to said central section 8a and having anincreased diameter, I

and first and second transition sections 8c disposed between saidcentral section 8a and said first and second outer sections 8b,respectively. From the inner surface of the central section 8a of saidtransverse bore 8 there extends an inlet passage 9 to an openingeccentrically disposed on the valve face 7. In order to facilitateproduction this inlet passage 9 is disposed coaxi ally with the rotaryaxis and provided with an eccentric open ing on the valve face 7. Thiseccentric opening extends radially outward to communicate in certainrotary positions of the valve member 5 relative to the valve disc 15with one or both of the disc passages 16 and 17, respectively. In theposition shown in FIGS. 2 to 4 the inlet passage 9 communicates viaequal cross-sectional areas with the first disc passage 16 and thesecond disc passage 17 so that a mixture of equal parts of cold and hotwater will be discharged. By a corresponding rotary movement of thefirst valve member 5 relative to the valve disc 15 any desired mixingratio can be obtained. The shape and the dimensions of the eccentricopening of the inlet passage 9 on the valve face 7 should be chosen toobtain the same total cross-sectional area in all intermediatepositions. In certain other cases it can be desirableto modify theexcentnc opening of the inlet passage 9 to provide differentcross-sectional areas in different intermediate positions.

The second valve member 12 is provided with first and second innersealing rings 13 which in the position shown sealingly engage the innersurface of the central section of the transverse bore 8. The secondvalve member 12 is further provided with first and second outer sealingrings 14 sealingly engaging the inner surface of the first and secondouter sections 8b, respectively, of the transverse bore 8. Thus, thereis formed an annular valve passage between said first and second innersealing rings 13 and communicating with said inlet passage 9, andannular spaces between each inner sealing ring 13 and the correspondingouter sealing ring 14. In the first valve member 5 there are furtherprovided first and second discharge lines 10 and 11, respectively, whichcommunicate at their inner ends and 11a with extend from the first andsecond transition sections 80, respectively, of the transverse bore 8and at the other ends thereof with corresponding annular grooves 23 and24, respectively, disposed on the circumferential surface of the firstvalve member 5. To both sides and between said annular grooves 23 and 24there are disposed sealing rings 22. The first annular groove 23communicates with the first discharge line 3, whereas the second annulargroove 24 communicates with the second discharge line 4.

An operating handle 27 is mounted by means of its U- shaped innerportion 26 on the second valve member 12 as clearly shown in FIG. 3.Secured to the first valve member is an obliquely slotted guide disk 35restricting the movement of the operating handle 27 relative thereto sothat pivoting the operating handle 27 causes rotational and axialmovement of the second valve member 12 within the transverse bore 8. Theguide disk 35 is provided with a pointer 36 movable between stopelements 37 on the valve housing 1 for restricting the rotationalmovement of the first valve member 5 relative thereto.

The modified embodiment of the mixing valve shown in FIGS. 5 to 7 isprovided with a transverse bore 8 having a cylindrical inner surface.The second valve member 12 is of corresponding cylindrical shape andreceived in the transverse bore 8 for rotary movement without axialdisplacement. The inlet passage 9 is a straight bore disposed inparallel to the rotary axis. The opening of the inlet passage 9 on thevalve face 7 and the disc passages 16 and 17 have substantially the samedistance from the rotary axis. The first discharge passage 10 extendsfrom the annular groove 23 to a point on the inner surface of thetransverse bore 8 which is substantially in line with the rotary axis.The second discharge line 11 extends from the transverse bore 8 upwardlyto an opening in the upper surface of the first valve member 5 which isoutside the valve housing 1. A second discharge line can be directlymounted to the opening of the second discharge passage 11 on the firstvalve member 5.

The cylindrical second valve member 12 is provided with a valve passagewhich communicates with the inlet passage 9 in all possible rotationalpositions of the second valve member 12 relative to the first valvemember 5. The valve passage on the other hand communicates in a firstrotational position with the first discharge passage 10, and in a secondrotational position with the second discharge line 11. In the embodimentshown in FIGS. 5 and 6, the valve passage comprises a straight radialthrough bore 120 connected by an axial passage 12b to a recessed slit12c extending over abt. 90 of the circumferential surface, as indicatedby the dotted line in FIG. 5. In

the position shown in FIGS. 5 and 6 the recessed slit communicates withthe inlet passage 9, and the straight thorough bore simultaneouslycommunicates with the first discharge passage 10. If the second valvemember 12 is turned counterclockwise by lifting the bail 26 of theoperating handle 27 by 90, the recessed slit is still communicating withthe inlet passage 9, whereas the straight thorough bore now communicateswith the second discharge line 11. If the second valve member 12 isturned from the position shown in FIG. 5 counter-clockwise by only 45,the straight thorough bore communicates with neither one of thedischarge lines. The shape and the dimensions of the openings of thestraight thorough bore should be chosen in order to obtain adequatedischarge rate control.

In the position shown in FIGS. 5 and 6 the inlet passage 9 communicatesvia the disc passages 16 and 17, respectively, to the corresponding feedlines 20 and 21, respectively, via equal cross-sectional areas, as shownin FIG. 7. In this position the discharge water is again composed ofequal parts of cold and hot water.

In FIG. 8 there is shown a modified version in which the disc passages16 and 17 are disposed in different radial distances from the rotaryaxis of the valve member 5. In this embodiment the second disc passageconnected to the second feed line 21 forms a widened recess on theinternal face of the valve disc 15. The shape of this widened opening21a is shown in FIGS. 8 and 9. In the position shown the dischargedwater will consist of a major part of cold water flowing from the coldwater feed line 20 into the opening 9a of the inlet passage 9,

that discharged water consists of equal parts of cold and hot water. Ifthe first valve member 5 is turned further counterclockwise, thedischarged water contains more and more hot water and less and less coldwater, until the inlet passage 9 comes out of communication with thecold water feed line 20. Now only hot water is discharged. If the firstvalve member 5 is turned still further counter-clockwise, due to theobliquely narrowed shape of the opening 21a the discharge volume is moreand more reduced. This is advantageous, in case the hot water isprepared by a flow heater, because for such flow heaters it is generallyundesirable to prepare tepid water by mixing a large portion of coldwater with a small portion of very hot water. According to theembodiment shown in FIGS. 8 and 9 the temperature of the hot waterincreases with the extent of counter-clockwise movement of the firstvalve member 5, and the throttling effect caused by the obliquelynarrowing oepning 21a serves to switch off the normal flow heater.

The modified mixing valve shown in FIGS. 10 to 13 generally correspondsto the embodiment shown in FIGS. 1 to 4, except for the inlet passageand the disc passages, which have been modified in order to adapt themixing valve for the use in combination with a low pressure boiler. Asshown in FIGS. 10 to 12, the first disc passage 16 is disposed at aradial distance from the rotary axis of the first valve member 5 andcommunicating with the cold water feed line, whereas the second discpassage 28 is disposed coaxially with said rotary axis and communicatingvia a connecting line to the outlet of .the low pressure boiler. A thirddisc passage 17 disposed in the same radial distance from said rotaryaxis as the first disc passage, communicates via a connecting line tothe inlet of said boiler. Besides that, the first valve member 5comprises an additional reversing channel 32 recessed into the valveface 7 and separated from the inlet channel 9 by a dividing edge 31. Inaccordance with the relative position of said dividing edge 31 relativeto the first disc passage 16 there is obtained a corresponding partialflow from the first disc opening 16 through the reversing channel 32,the third disc opening 17, the connecting line 18, a boiler (not shown),the connecting line 19, the second disc passage 28 into the inletpassage 9. This embodiment is especially suited for low pressureboilers.

The mixing valve of the invention is actuated by turning and/or pivotingthe operating handle 27. A rotary movement of the operating handle 27causes a rotary movement of the first valve member 5 relative to thevalve disc 15 and a corresponding alteration of the mixing ratio. Apivotal movement of the operating handle 27 causes a rotary movement ofthe second valve member 12 relative to the first valve member 5 and thusadjusts the discharge rate. At the same time, the direction of thepivotal movement of the operating handle 27 decides, whether the wateris discharged through discharge line 3 into the bath-tub (not shown), orthrough discharge line 4 to a shower (not shown).

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofconstruction differing from the types described above.

While the invention has been illustrated and described as a mixing valveespecially useful for mixing cold and hot water, it is likewise usefulfor many other similar technical purposes in which it is desired toenable an independent control of the discharge volume, the mixing ratioand the discharge direction of two miscible liquids by a singleoperating handle. Besides that, it is not intended to be limited to thedetails shown, since various modifications and structural changes may bemade without departing in any way from the spirit of the presentinvention.

What is claimed as new and desired to be protected by letters patent isset forth in the appended claims.

I claim:

1. A mixing valve enabling independent control of the discharge volume,the mixing ratio and the discharge direction of two miscible liquids,especially cold water and hot water, by a single operating handle, saidmixing valve comprising a valve housing having a ,valve receiving bore;a valve disc nonrotatably mounted in said valve receiving bore; a firstvalve member received in said valve receiving bore for movement about arotary axis and having a valve face symmetrical to the rotary axis andfitted in sliding'contact against the internal face of said valve disc;first and second disc passages disposed in said valve disc eccentricallyand at a predetermined angular distance relative to the rotary axis ofsaid first valve member; a transverse bore disposed in said first valvemember; an inlet passage extending from the inner surface to saidtransverse bore to an opening eccentrically disposed on said valve face,said first valve member being movable relative to said valve discbetween a first position in which said inlet passage com municates withsaid first disc passage, a second position in which said inlet passagecommunicates with said second disc passage, and a plurality ofintermediate positions, in each of which said inlet passage communicateswith both disc passages in a certain predetermined ratio ofcross-sections; first and second discharge passages extending from firstand second points, respectively of the inner surface of said transversebore to first and second outward openings, respectively; first andsecond discharge lines communicating with the outward openings of saidfirst and second discharge passages, respectively; a second valve memberreceived in said transverse bore and having a valve passagecommunicating with said inlet passage, said second valve member beingmovable between a first discharge position in which said valve passagecommunicates with first discharge passage, a second discharge positionin which said valve passage communicates with said second dischargepassage, and an intermediate position in which said valve passagecommunicates with neither one of the discharge passages; first andsecond feed lines for said miscible liquids communicating with saidfirst and second disc passages, respectively, and operating meanscomprising an operating handle mounted on said second valve member andconnected to said first valve member for the independent movement ofsaid first and second valve members between the first, second andintermediate positions thereof.

2. Mixing valve as defined in claim 1, wherein the transverse borecomprises a cylindrical central section, first and second cylindricalouter sections coaxial to said central section and having an increaseddiameter, and first and second transition sections disposed between saidcentral section and said first and second outer sections, respectively,

the inlet passage opens into said central section, said first and seconddischarge passages open into said first and second transition sections,respectively, said second valve member is received within saidtransverse bore for rotational and axial movement,

said second valve member having mounted thereon first and second outwardsealing rings sealingly engaging the inner surface of said first andsecond outer sections, respectively, of said transverse bore, and firstand second inner sealing rings adapted to sealingly engage in theintermediate position of said second valve member the inner surface ofthe central section of said transverse bore,

said second valve member further having an annular valve passage definedbetween said first and second inner sealing rings and communicating withsaid inlet passage, said second valve member being axially movablebetween first and second discharge positions, in which the respectiveone of thefirst and second inner sealing rings is moved out of contractwith the central section of said transverse bore, thus providing apassage between said inlet passage and the respective one of the firstand second discharge passages.

3. Mixing valve as defined iiiclaim 1, wherein said transverse bore hasa cylindrical inner surface, said second valve member is received insaid transverse bore for only rotational movement, and IS provided witha valve passage which in all rotational positions of said second valvemember communicates with said inlet passage, and in certain differentrota-v tional positions of said second valve member communicates withone of said discharge passages.

4. Mixing valve as defined in claim 1, wherein at least one of saidfirst and second discharge passages extends to a circumferential annulargroove on said first valve member, each groove defines a separateannular space between said first valve member and said valve housing, atleast one of said first and second discharge lines extends through thewall of said valve housing and communicates with the respective annulargroove.

5. Mixing valve as defined in claim 1, wherein one of said first andsecond discharge passages communicates with a respective discharge lineextending through said valve disc coaxially to the rotary axis of saidfirst valve member.

6. Mixing valve as defined in claim 1, wherein one of said first andsecond discharge passages communicates with a respective discharge linedirectly connected to said first valve member.

7. Mixing valve as defined in claim I, wherein said first valve memberis provided with guide means restricting the movement of said operatinghandle relative thereto.

8. Mixing valve as defined in claim 1, wherein said first and seconddisc passages are disposed close to each other in the same radialdistance from the rotary axis of said first valve 9. Mixing valve asdefined in claim 1, wherein said first and.

second disc passages are disposed in different radial distances from therotary axis of said first valve member.

10. Mixing valve as defined in claim 1 adapted for mixing treated andnon-treated portions of the same liquid, especially cold water and hotwater, wherein said valve disc is provided with a first disc passagedisposed at a radial distance from the rotary axis of said first valvemember and communicating with a first feed line for untreated liquid, asecond disc passage disposed coaxially with said rotary axis andcommunicating via connecting line to the outlet of a liquid treatingdevice, and a third disc passage disposed in the same radial distancefrom said rotary axis as the first disc passage, said third disc passagecommunicating via a connecting line to the inlet of said liquid treatingdevice, and

said first valve member is further provided with a reversing channelseparated from the opening of said inlet passage by a dividing edgewhich in accordance with the relative position of said dividing edge tosaid first disc passage provides for a corresponding partial flowthrough said reversing channel, said third disc passage, said liquidtreating device and said second disc passage into said inlet passage.

11. Mixing valve as defined in claim 1, wherein said transverse boreafter insertion of said second valve member is tightly closed on bothends thereof by cover members,

each of said first and second transition sections forms an annular valveseat,

said second valve member is divided into a first and a second valvepiston biased by first and second spring means, respectively, againstsaid first and second annular valve seats respectively, and

said operating handle is mounted for pivotal motion in oppositedirections adapted to remove one of said valve pistons from thecorresponding annular valve seat.

IF l

1. A mixing valve enabling independent control of the discharge volume,the mixing ratio and the discharge direction of two miscible liquids,especially cold water and hot water, by a single operating handle, saidmixing valve comprising a valve housing having a valve receiving bore; avalve disc non-rotatably mounted in said valve receiving bore; a firstvalve member received in said valve receiving bore for movement about arotary axis and having a valve face symmetrical to the rotary axis andfitted in sliding contact against the internal face of said valve disc;first and second disc passages disposed in said valve disc eccentricallyand at a predetermined angular distance relative to the rotary axis ofsaid first valve member; a transverse bore disposed in said first valvemember; an inlet passage extending from the inner surface to saidtransverse bore to an opening eccentrically disposed on said valve face,said first valve member being movable relative to said valve discbetween a first position in which said inlet passage communicates withsaid first disc passage, a second position in which said inlet passagecommunicates with said second disc passage, and a plurality ofintermediate positions, in each of which said inlet passage communicateswith both disc passages in a certain predetermined ratio ofcross-sections; first and second discharge passages extending from firstanD second points, respectively of the inner surface of said transversebore to first and second outward openings, respectively; first andsecond discharge lines communicating with the outward openings of saidfirst and second discharge passages, respectively; a second valve memberreceived in said transverse bore and having a valve passagecommunicating with said inlet passage, said second valve member beingmovable between a first discharge position in which said valve passagecommunicates with first discharge passage, a second discharge positionin which said valve passage communicates with said second dischargepassage, and an intermediate position in which said valve passagecommunicates with neither one of the discharge passages; first andsecond feed lines for said miscible liquids communicating with saidfirst and second disc passages, respectively, and operating meanscomprising an operating handle mounted on said second valve member andconnected to said first valve member for the independent movement ofsaid first and second valve members between the first, second andintermediate positions thereof.
 2. Mixing valve as defined in claim 1,wherein the transverse bore comprises a cylindrical central section,first and second cylindrical outer sections coaxial to said centralsection and having an increased diameter, and first and secondtransition sections disposed between said central section and said firstand second outer sections, respectively, the inlet passage opens intosaid central section, said first and second discharge passages open intosaid first and second transition sections, respectively, said secondvalve member is received within said transverse bore for rotational andaxial movement, said second valve member having mounted thereon firstand second outward sealing rings sealingly engaging the inner surface ofsaid first and second outer sections, respectively, of said transversebore, and first and second inner sealing rings adapted to sealinglyengage in the intermediate position of said second valve member theinner surface of the central section of said transverse bore, saidsecond valve member further having an annular valve passage definedbetween said first and second inner sealing rings and communicating withsaid inlet passage, said second valve member being axially movablebetween first and second discharge positions, in which the respectiveone of the first and second inner sealing rings is moved out of contractwith the central section of said transverse bore, thus providing apassage between said inlet passage and the respective one of the firstand second discharge passages.
 3. Mixing valve as defined in claim 1,wherein said transverse bore has a cylindrical inner surface, saidsecond valve member is received in said transverse bore for onlyrotational movement, and is provided with a valve passage which in allrotational positions of said second valve member communicates with saidinlet passage, and in certain different rotational positions of saidsecond valve member communicates with one of said discharge passages. 4.Mixing valve as defined in claim 1, wherein at least one of said firstand second discharge passages extends to a circumferential annulargroove on said first valve member, each groove defines a separateannular space between said first valve member and said valve housing, atleast one of said first and second discharge lines extends through thewall of said valve housing and communicates with the respective annulargroove.
 5. Mixing valve as defined in claim 1, wherein one of said firstand second discharge passages communicates with a respective dischargeline extending through said valve disc coaxially to the rotary axis ofsaid first valve member.
 6. Mixing valve as defined in claim 1, whereinone of said first and second discharge passages communicates with arespective discharge line directly connected to said first valve member.7. Mixing valve as defined in claim 1, wherein said fIrst valve memberis provided with guide means restricting the movement of said operatinghandle relative thereto.
 8. Mixing valve as defined in claim 1, whereinsaid first and second disc passages are disposed close to each other inthe same radial distance from the rotary axis of said first valvemember, and the shape and dimension of the opening of said inlet passageon the valve face of said first valve member are adapted to provide inthe intermediate positions such cross-sections of communication withboth of said first and second disc passages which together permit anunreduced discharge volume.
 9. Mixing valve as defined in claim 1,wherein said first and second disc passages are disposed in differentradial distances from the rotary axis of said first valve member. 10.Mixing valve as defined in claim 1 adapted for mixing treated andnon-treated portions of the same liquid, especially cold water and hotwater, wherein said valve disc is provided with a first disc passagedisposed at a radial distance from the rotary axis of said first valvemember and communicating with a first feed line for untreated liquid, asecond disc passage disposed coaxially with said rotary axis andcommunicating via connecting line to the outlet of a liquid treatingdevice, and a third disc passage disposed in the same radial distancefrom said rotary axis as the first disc passage, said third disc passagecommunicating via a connecting line to the inlet of said liquid treatingdevice, and said first valve member is further provided with a reversingchannel separated from the opening of said inlet passage by a dividingedge which in accordance with the relative position of said dividingedge to said first disc passage provides for a corresponding partialflow through said reversing channel, said third disc passage, saidliquid treating device and said second disc passage into said inletpassage.
 11. Mixing valve as defined in claim 1, wherein said transversebore after insertion of said second valve member is tightly closed onboth ends thereof by cover members, each of said first and secondtransition sections forms an annular valve seat, said second valvemember is divided into a first and a second valve piston biased by firstand second spring means, respectively, against said first and secondannular valve seats respectively, and said operating handle is mountedfor pivotal motion in opposite directions adapted to remove one of saidvalve pistons from the corresponding annular valve seat.